Engineering the Optical Properties of CsPbBr3 Nanoplatelets through Cd2+ Doping

Abstract

Lead halide perovskite nanoplatelets (NPls) attract significant attention due to their exceptional and tunable optical properties. Doping is a versatile strategy for modifying and improving the optical properties of colloidal nanostructures. However, the protocols for B-site doping have been rarely reported for 2D perovskite NPls. In this work, we investigated the post-synthetic treatment of CsPbBr3 NPls with different Cd2+ sources. We show that the interplay between Cd2+ precursor, NPl concentrations, and ligands determines the kinetics of the doping process. Optimization of the treatment allows for the boosting of linear and nonlinear optical properties of CsPbBr3 NPls via doping or/and surface passivation. At a moderate doping level, both the photoluminescence quantum yield and two-photon absorption cross section increase dramatically. The developed protocols of post-synthetic treatment with Cd2+ facilitate further utilization of perovskite NPls in nonlinear optics, photonics, and lightning.

Anion-assisted Yb3+and Mn2+doping of 0D and 2D lead halide perovskite nanostructures

“…31 It should be noted that post-synthetic doping techniques have been mainly developed for cubic NCs, while relatively little research has been devoted to doping LHP nanostructures with more complex geometries. [32][33][34][35] In this regard, an urgent task is the development of universal, nondestructive and efficient methods for doping LHP nanostructures of various chemical compositions and morphologies.…”

B‐Site Doping of Metal Halide Perovskite Nanoplatelets Influences Their Optical Properties

“…Skurlov et al studied the influence of Cd 2+ doping on the two-photon absorption cross-section of CsPbBr 3 NPls using two-photon absorption-induced PL measurements (Figure 7c). [78] The post-synthetic treatment of the NPls allowed for finely tuning the doping ratio, which could be precisely monitored through a shift of the PL peak position. It was demonstrated that even a small fraction of inserted Cd 2+ ions induced a strong increase in the third-order nonlinear optical responses of perovskite NPls (Figure 7d).…”

“…Reproduced under CC BY license. [78] excitation. [90] Volume-normalized two-and three-absorption cross-sections enlarged from 183 to 1237 GM nm −3 (where GM is 10 −50 cm 4 •s•photon −1 ) and from 3.1 × 10 −79 to 2.24 × 10 −78 cm 6 •s 2 •photon −2 nm −3 , respectively, when the dimensionality of perovskite nanocrystals reduced from 3D to 2D.…”

Thickness-Dependent Photoluminescence Properties of Mn-Doped CsPbBr3 Perovskite Nanoplatelets Synthesized at Room Temperature

“…Recently, impurity ion doping has gained significant attention for its ability to control the optical properties of perovskite NPLs. − Among various dopants, Mn 2+ is the most widely investigated. − It is well-established that the introduction of Mn 2+ ions into the host material leads to the emergence of new magnetic and optical properties. This process involves energy transfer from excitons within the host to Mn 2+ ions, resulting in the emission of orange-red light due to the spin-forbidden 4 T 1 → 6 A 1 Mn 2+ d-d transition.…”